Q: My mechanic said I needed an alternator. He fixed the starter now My car is making this loud knocking noise, what could it be?

asked by on

There is a loud knocking noise on the driver's side under the hood when the car is turned on and when the gas pedal is pushed upon acceleration.

My car has 230000 miles.
My car has an automatic transmission.

Hi there. I believe we answered your question earlier, but if the mechanic is telling you that you need an alternator, it’s possible the noise and the power issue is related. The alternator, like many other accessory systems is powered by a serpentine belt. The belt is driven by a series of pulley’s. and when they wear out, a ticking noise is one of the most common symptoms. Again, without being there to complete an inspection, any repair suggestions would be guesses on our part and not very responsible on our behalf. I really believe it is best for you to seek a second opinion by having one of our mobile mechanics complete the car is making a noise inspection. You can click this link to set up the service if you’d like.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My mechanic said I needed an alternator. He fixed the starter now My car is making this loud knocking noise, what could it be?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Rubbing/vibrating noise from front end

Hello. From what you describe it would appear that your tire may be making contact with something and causing the noise and vibration. Noises can be difficult to diagnose without driving the vehicle, however if you have determined what wheel...

Q: Dash lights came on and gauges dropped to zero

Hello there, thanks for writing in about your 2006 Chevrolet Trailblazer EXT. First, I would suspect a faulty ignition switch, and would put that near the top of my diagnostic checklist. I also recommend a thorough visual inspection, testing of...

Q: Is the Chrysler Sebring a good car?

Hi there, thanks for writing in. For the most part, the 2008 Chrysler Sebring is a decent used car. However, like any other used vehicle, the overall condition of the vehicle is largely based on the previous owner and how...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...